[R] can we visualize water flows with 3d in R?

Fri Oct 14 10:13:06 CEST 2016

Hi Marna

These are a few suggestions for EDA of your data

Firstly check it – it is laborious work but it needs to be done – use a proper database if R is not suitable (memory,time)

dat <- read.csv("G:/1/example_subsetdata.csv")

dat <- subset(dat, !is.na(depth))

apply(dat,2,range,na.rm=T)

table(cut(dat$depth, breaks = seq(496.5, 498.5, 0.25), include.lowest = TRUE, labels = F)) # needs more groups to even out numbers 

# use hand drafted breaks

table(dat$Y)

dat$ldepth <- cut(dat$depth, breaks = seq(496.5, 498.5, 0.25), include.lowest = TRUE, labels = F)

xyplot(Y ~ X|factor(ldepth), subset(dat, Y > 400), pch = ".", as.table = TRUE)

xyplot(flow ~ X|factor(ldepth), subset(dat, Y > 400), pch = ".", as.table = TRUE, col =1)

xyplot(flow ~ Y|factor(ldepth), subset(dat, Y > 400), pch = ".", as.table = TRUE, col =1)

I have made pch = ‘.’ so that  points are not overtopping. increase by by units ie cex = 2 , cex =3 if you want to make them larger

Have a look a lattice::par.settings  and names(trellis.par.get()) these will make things easier if you you are using panel functions.

I did not go further but the next step in this would be lattice 3d plots contourplot wireframe etc.
You will get more information in working with the full dataset

I have not really gone into spatials  but you should look at the task view on spatial analysis.
and the spatial SIG

How you proceed will be partly determined by your future requirements of which I am not qualified.

Regards

Duncan

From: Marna Wagley [mailto:marna.wagley at gmail.com] 
Sent: Friday, 14 October 2016 03:13
To: Duncan Mackay
Subject: Re: [R] can we visualize water flows with 3d in R?

Hi Duncan, 

Thank you very much for the message. Indeed I do have a very big data set with a grid size of 10cm * 10 cm. Every 10 cm*10cm grid has the value of X,Y, depth and flow measurement. I have attached a subset of the data. 

Thanks 

On Wed, Oct 12, 2016 at 11:05 PM, Duncan Mackay <dulcalma at bigpond.com> wrote:

Hi

With a small data set 3D is not really an option;  reduce the number of
dimensions-- 2D conditional

library(lattice)
xyplot(flow ~ depth|factor(long), dat1, groups = lat, type = c("p","r"), pch
= 16)

I had started with lat and long reversed doing EDA gave the above
? latitude effect

Regards

Duncan

Duncan Mackay
Department of Agronomy and Soil Science
University of New England
Armidale NSW 2351
Email: home: mackay at northnet.com.au

-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Marna Wagley
Sent: Wednesday, 12 October 2016 19:49
To: r-help mailing list
Subject: [R] can we visualize water flows with 3d in R?

Hi R Users,
Is it possible to visualize river flow in  3D (latitude, longitude with
respect to depth)?
The example of my data looks like. Any suggestions?

> dat1
    long lat depth flow
1 1015.9 857  1.00 1.50
2 1015.9 857  1.25 1.23
3 1015.9 857  0.50 2.00
4 1015.9 858  0.10 1.95
5 1015.9 858  0.20 1.50
6 1025.0 858  0.30 1.20
7 1025.0 858  0.40 0.50
8 1025.0 858  0.35 0.70
9 1025.0 858  0.24 1.20

Thanks for your help.
thanks

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